std::string code snippet to get a filename's extension.

Thanks goes to Curtis Krauskopf, who supported me to improve the (terrible and error-prone) code of GetExtension.

View the code of 'GetExtension' in plain text
Download the Qt Creator project 'CppGetExtension' (zip)


#include <string>

#include <cassert>



//Returns the extension of a filename

//Assumes that the filename has an extension

//From http://www.richelbilderbeek.nl/CppGetExtension.htm

const std::string GetExtension(const std::string& filename)

{

  const std::size_t i = filename.rfind('.');

  assert(i != std::string::npos && "Filename must contain a dot");

  assert(i != filename.size() - 1 && "Filename must not end with a dot");

  assert(filename[i+1] != '\\' && "Filename must have an extension");

  assert(filename[i+1] != '/' && "Filename must have an extension");

  return filename.substr(i+1,filename.size());

}

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(C++) GetExtension